An ice-skater starts her pirouette with arms outstretched, rotating at 1.9 rev/s. Estimate her rotational speed (in revolutions per second) when she brings her arms flat against her body. (We assume that her body mass (not including her arms) is 50 kg and that each arm has a mass of 4.0 kg. Let's also assume that her arms are 1.0 m long and that her body is cylindrical with a radius of 20 cm.)
Angular speed, acceleration and displacement
Angular acceleration is defined as the rate of change in angular velocity with respect to time. It has both magnitude and direction. So, it is a vector quantity.
Angular Position
Before diving into angular position, one should understand the basics of position and its importance along with usage in day-to-day life. When one talks of position, it’s always relative with respect to some other object. For example, position of earth with respect to sun, position of school with respect to house, etc. Angular position is the rotational analogue of linear position.
An ice-skater starts her pirouette with arms outstretched, rotating at 1.9 rev/s. Estimate her rotational speed (in revolutions per second) when she brings her arms flat against her body. (We assume that her body mass (not including her arms) is 50 kg and that each arm has a mass of 4.0 kg. Let's also assume that her arms are 1.0 m long and that her body is cylindrical with a radius of 20 cm.)
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